Method of manufacturing display apparatus and the display apparatus

ABSTRACT

Provided are a method of manufacturing a display apparatus and the display apparatus. The method includes forming an emissive layer and a driving layer on a first area of a substrate, forming an exposure line electrically connected to the driving layer, on a second area of the substrate, and forming a color conversion layer on the driving layer by emitting light from the emissive layer using the exposure line.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. application Ser. No.16/666,593 filed Oct. 29, 2019, which is based on and claims priorityunder 35 U.S.C. § 119 from Korean Patent Application No.10-2018-0165370, filed on Dec. 19, 2018, in the Korean IntellectualProperty Office, the disclosure of which is incorporated herein in itsentirety by reference.

BACKGROUND 1. Field

The disclosure relates to methods of manufacturing a display apparatushaving a small pixel size and the display apparatus having the smallpixel size.

2. Description of the Related Art

Liquid crystal displays (LCD) and organic light-emitting diode (OLED)displays are widely used as display apparatuses. Recently, the techniqueof manufacturing a high-resolution display apparatus by using amicro-light-emitting diode (LED) has been drawing attention. However,highly efficient compact LED chips are needed for the manufacture ofhigh-resolution display apparatuses, and a difficult transfer techniqueis required to arrange compact LED chips at appropriate positions.

SUMMARY

Provided are methods of manufacturing a display apparatus, in which acolor conversion layer is formed by using light emission in the displayapparatus itself.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

According to an aspect of the disclosure, there is provided a method ofmanufacturing a display apparatus, the method comprising: forming anemissive layer on a first area of a substrate; forming, on the emissivelayer, a driving layer comprising a plurality of driving elements usedto emit light from the emissive layer; forming an exposure line on asecond area of the substrate, the exposure line being electricallyconnected to the driving layer; and forming a color conversion layer onthe driving layer by emitting the light from the emissive layer by usingthe exposure line.

The forming of the emissive layer may comprise forming a plurality oflight-emission areas respectively corresponding to a plurality ofpixels, and connecting the plurality of light-emission areas to eachother via dummy areas of the emissive layer.

The forming of the driving layer may comprise forming a plurality ofscan lines extending in a first direction; and forming a plurality ofdata lines extending in a second direction intersecting the firstdirection, wherein the plurality of driving elements are respectivelyconnected to the plurality of scan lines and the plurality of datalines, and the plurality of data lines are electrically connected to theexposure line.

The exposure line may extend in a direction intersecting the seconddirection.

The exposure line may extend in the first direction.

The forming of the exposure line may comprise forming a first exposureline for forming a first color conversion layer; and forming a secondexposure line for forming a second color conversion layer, wherein thefirst exposure line is connected to a first group data line from amongthe plurality of data lines, and the second exposure line is connectedto a second group data line from among the plurality of data lines.

The forming of the color conversion layer may comprise forming a firstcolor conversion material on the driving layer; applying a first signalto the first exposure line to emit first light from a first area of theemissive layer corresponding to the first group data line; forming afirst color conversion layer by hardening a portion of the first colorconversion material that overlaps the first area of the emissive layerbased on the first signal applied to the first exposure line; andremoving a portion of the first color conversion material that is nothardened.

The method may further comprise forming a second color conversionmaterial on the driving layer; applying a second signal to the secondexposure line to emit second light from a second area of the emissivelayer corresponding to the second group data line; forming a secondcolor conversion layer by hardening a portion of the second colorconversion material that overlaps the second area of the emissive layerbased on the second signal applied to the second exposure line; andremoving a portion of the second color conversion material that is nothardened.

When an on signal is applied to the first exposure line, an off signalis may be applied to the second exposure line, and when an on signal isapplied to the second exposure line, an off signal may be applied to thefirst exposure line.

The method may further comprise applying a third signal to the firstexposure line and the second exposure line to discharge a charge in theemissive layer and the plurality of driving elements.

The forming of the color conversion layer may be performed while a scansignal is applied to the plurality of scan lines.

The forming of the color conversion layer may be performed while an onsignal is applied to the plurality of scan lines.

The exposure line may be directly connected to one or more of theplurality of data lines.

The exposure line may be electrically connected to the plurality of datalines via a switching device.

The switching device may comprise a plurality of transistors whichelectrically connect each of the plurality of data lines to the exposureline.

The switching device may comprise a multiplexer.

The method may further comprise, after forming the color conversionlayer, separating the substrate into a third area including the emissivelayer and fourth area including the exposure line, and removing thefourth area from the third area.

The method may further comprise, before forming the color conversionlayer, forming a plurality of barriers defining a pixel on the drivinglayer.

At least one of the plurality of barriers may have a tapered shape witha width decreasing from a lower portion to an upper portion thereof.

A size of the pixel may be 500 ppi or more.

The emissive layer, the driving layer, the exposure line, and the colorconversion layer may be monolithically formed.

According to another aspect of the disclosure, there is provided adisplay apparatus comprising: a plurality of scan lines extending in afirst direction; a plurality of data lines extending in a seconddirection intersecting the first direction; a plurality of pixelsrespectively corresponding to the plurality of scan lines and theplurality of data lines; a plurality of first electrode padselectrically connected to the plurality of scan lines; a plurality ofsecond electrode pads electrically connected to the plurality of datalines; a scan driver configured to apply a scan signal to the pluralityof scan lines through the first electrode pads; a data driver configuredto apply a data signal to the plurality of data lines through theplurality of second electrode pads; and a plurality of first dummy linesprotruding from the second electrode pads in a same direction as theplurality of data lines.

The display apparatus may further comprise a plurality of second dummylines protruding from the first electrode pads in a same direction asthe plurality of scan lines.

According to another aspect of the disclosure, there is provided asemiconductor device comprising: a substrate; an emissive layer providedon a substrate; a driving layer provided on the emissive layer; asemiconductor layer self-formed on the driving layer, the semiconductorlayer hardened based on light emitted from the emissive layer.

The self-formed layer may be a color conversion layer.

The semiconductor layer may comprise quantum dots.

According to another aspect of the disclosure, there is provided amethod of manufacturing a semiconductor device comprising: providing anemissive layer on a substrate; providing a driving layer provided on theemissive layer; providing a semiconductor layer formed on the drivinglayer; and hardening the semiconductor layer based on light emitted fromthe emissive layer.

The semiconductor layer may be a color conversion layer.

The semiconductor layer may comprise quantum dots.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the accompanying drawings in which:

FIG. 1 is a schematic plan view of a display apparatus according to anembodiment of the disclosure;

FIG. 2 is a block diagram illustrating the display apparatus of FIG. 1;

FIG. 3 is a circuit diagram of a pixel included in the display apparatusof FIG. 1;

FIG. 4 is a cross-sectional view of a portion of a display area of adisplay apparatus according to an embodiment;

FIG. 5 is a reference diagram for describing a method of forming anemissive layer, according to an embodiment;

FIGS. 6A and 6B are reference diagrams for describing a method offorming a driving layer, according to an embodiment;

FIG. 7A is a reference diagram for describing a method of forming abarrier, according to an embodiment;

FIG. 7B is a reference diagram illustrating a method of mounting a scandriver and an exposure controlling apparatus, according to anembodiment;

FIGS. 8A, 8B, and 9 are reference diagrams for describing a method offorming a first color conversion layer, according to an embodiment;

FIGS. 10A, 10B, and 11 are reference diagrams for describing a method offorming a first color conversion layer, according to an embodiment;

FIGS. 12A, 12B, and 13 are reference diagrams for describing a method offorming a second color conversion layer, according to an embodiment;

FIG. 14 is a reference diagram for describing a method of separating adisplay unit from an exposure line, according to an embodiment;

FIG. 15 illustrates a display apparatus including an exposure lineaccording to an embodiment;

FIG. 16 illustrates a substrate on which a plurality of pre-displayareas are formed, according to an embodiment;

FIG. 17 is a reference diagram illustrating a method of forming a colorconversion layer without using a scan driver, according to anembodiment;

FIG. 18 illustrates an example of a substrate that is cut in theembodiment of FIG. 17;

FIG. 19 is a reference diagram for describing a method of forming acolor conversion layer, according to another embodiment;

FIG. 20 illustrates an example of a substrate that is cut in theembodiment of FIG. 19;

FIG. 21 is a reference diagram illustrating a method of forming a colorconversion layer in a display apparatus including a switching circuit,according to another embodiment; and

FIG. 22 is a reference diagram illustrating a method of applying asignal to exposure lines, according to another embodiment.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments, examples of whichare illustrated in the accompanying drawings, wherein like referencenumerals refer to like elements throughout. In this regard, theembodiments may have different forms and should not be construed asbeing limited to the descriptions set forth herein. Accordingly, theembodiments are merely described below, by referring to the figures, toexplain aspects. Expressions such as “at least one of,” when preceding alist of elements, modify the entire list of elements and do not modifythe individual elements of the list.

The disclosure will now be described more fully with reference to theaccompanying drawings, in which embodiments of the disclosure are shown.In the drawings, like reference numerals denote like elements, and sizesof elements in the drawings may be exaggerated for clarity andconvenience of description. Embodiments described herein are examplesonly, and may include various modifications.

Throughout the specification, it will also be understood that when anelement is referred to as being “on” another element, it can be directlyon the other element, or intervening elements may also be present.

An expression used in the singular form encompasses the expression inthe plural form, unless it has a clearly different meaning in thecontext. It is to be understood that the terms such as “including”,etc., are intended to indicate the existence of the components, and arenot intended to preclude the possibility that one or more othercomponents may be added.

While such terms as “first,” “second,” etc., may be used herein, theabove terms are used only to distinguish one element from another.

FIG. 1 is a schematic plan view of a display apparatus 1 according to anembodiment of the disclosure. FIG. 2 is a block diagram illustrating thedisplay apparatus 1 of FIG. 1. FIG. 3 is a circuit diagram of a pixelincluded in the display apparatus 1 of FIG. 1.

Referring to FIG. 1, according to an embodiment, the display apparatus 1may include a display area DA and a non-display area NDA. According toan embodiment, the display apparatus 1 may be divided into a displayarea DA and a non-display area NDA. The display area DA is an areadisplaying an image, and may be referred to as a display unit. Thedisplay area DA may include a plurality of pixels P to display an image,and each pixel may include a plurality of sub-pixels emitting light ofdifferent colors, and each sub-pixel may include a transistor used fordriving, a capacitor, a light-emission area or the like. Hereinafter,each sub-pixel will be described as a pixel for convenience ofdescription.

Referring to FIG. 2, the display apparatus 1 may include a display unit10, a scan driver 20, a data driver 30, and a processor 40. The displayunit 10 may be arranged on the display area DA of FIG. 1, and the scandriver 20, the data driver 30, and the processor 40 may be arranged onthe non-display area NDA.

The display unit 10 may include scan lines S via which a scan signal istransmitted, data lines D through which a data signal is transmitted inresponse to a scan signal from the scan lines S, and a plurality ofpixels P corresponding to the data lines D and the scan lines S.According to an embodiment, the plurality of pixels P may be defined bythe data lines D and the scan lines S. The scan lines S and the datalines D respectively receive signals from the scan driver 20 and thedata driver 30 arranged in the non-display area NDA, and thus, mayextend to the non-display area NDA.

While the scan lines S extend in a first direction X and the data linesD extend in a second direction Y crossing the first direction X in FIG.2, the disclosure is not limited thereto. That is, directions in whichthe data lines D and the scan lines S extend may be exchanged.

Referring to FIG. 3, each pixel P may include a light-emitting portion Land a pixel circuit C for supplying a current to the light-emittingportion L.

A first electrode of the light-emitting portion L is connected to thepixel circuit C, and a second electrode of the light-emitting portion Lis connected to a second power source VSS. The first electrode may bereferred to as a pixel electrode, and the second electrode may bereferred to as an opposite electrode or a common electrode. Thelight-emitting portion L generates light of a certain brightness inaccordance with a current supplied from the pixel circuit C.

The pixel circuit C includes at least two transistors and at least onecapacitor, and in detail, the pixel circuit C includes a switchingtransistor MS used to transmit a data signal, a driving transistor MDused to drive an organic light-emitting device according to a datasignal, and a capacitor Cgs used to maintain a data voltage. The numberof transistors and capacitors are not limited to the above, and moretransistors and more capacitors may also be included as is obvious.

The driving transistor MD is connected to the light-emitting portion Lto supply a current for light emission. A current amount of the drivingtransistor MD may be controlled based on a data signal applied via theswitching transistor MS. The capacitor Cgs is used to maintain anapplied voltage for a certain period, and is connected between a sourceand a gate of the driving transistor MD.

Each pixel P may be controlled based on an amount of a current that issupplied from a first power source VDD to a second power source VSS andpasses the light-emitting portion L in the meantime, in accordance witha data signal. Then light of a certain brightness is emitted in alight-emission area.

The scan driver 20 applies a scan signal to the scan lines S, and mayact as a switch such that a data signal applied via the data lines Daccording to the scan signal is applied to the driving transistor MD ineach pixel P.

The processor 40 may generate RGB image data, which is digital imagedata based on an image signal received from the outside or by itself.

The data driver 30 may generate a data signal corresponding to RGB imagedata provided by the processor 40 and apply the data signal to the datalines D. According to an embodiment, the data driver 30 may include alatch circuit, a level shifter circuit, or the like. A latch circuit maystore RGB image data that is serially received and store the RGB data toapply a data signal to the display unit 10 in parallel. A latch shiftercircuit may adjust a level of an actual voltage applied to the displayunit 10. Detailed structures of a latch circuit and a level shiftercircuit are obvious to one of ordinary skill in the art, and thusdetailed description thereof will be omitted.

FIG. 4 is a cross-sectional view of a portion of the display unit 10 ofthe display apparatus 1 according to an embodiment. Referring to FIG. 4,the display apparatus 1 may include a plurality of pixels PR, PG, andPB, and the pixels PR, PG, and PB may include a first pixel PR emittingred light, a second pixel PG emitting green light, and a third pixel PBemitting blue light.

The display apparatus 1 may include a substrate 110, an emissive layer120 arranged on the substrate 110, and a driving layer 130 arranged onthe emissive layer 120 and including a plurality of driving elements132, and a plurality of color conversion layers 140R, 140G, and 140Barranged on the driving layer 130.

The substrate 110 may include a substrate used to grow the emissivelayer 120. The substrate 110 may include various materials used ingeneral semiconductor processes. For example, a silicon substrate or asapphire substrate may be used as the substrate 110. However, this ismerely an example, and other various materials may also be used as thesubstrate 110.

The emissive layer 120 emitting light is arranged on an upper surface ofthe substrate 110. The emissive layer 120 may include a plurality oflight-emission areas respectively corresponding to a plurality ofpixels, and the plurality of light-emission areas may be connected toeach other via portions of the emissive layer 120. For example, theemissive layer 120 may include a first light-emission area 120Rcorresponding to the first pixel PR, a second light-emission area 120Gcorresponding to the second pixel PG, and a third light-emission area120B corresponding to the third pixel PB. The first light-emission area120R may be connected to the second light-emission area 120G via a firstdummy area 120D of the emissive layer 120, and the second light-emissionarea 120G may be connected to the third light-emission area 120B via asecond dummy area 120E of the emissive layer 120. According to anembodiment, the first light-emission area 120R, the secondlight-emission area 120G and the third light-emission area 120B aredefined by a first electrode 131 which will be described later,According to an embodiment, the first light-emission area 120R, thesecond light-emission area 120G and the third light-emission area 120Band the first and second dummy areas 120D and 120E may be formed ofsubstantially identical materials.

The emissive layer 120 may be a light-emitting diode (LED) layer basedon an inorganic material. The emissive layer 120 may emit, for example,blue light. However, the emissive layer 120 is not limited thereto. Theemissive layer 120 may emit light of a certain wavelength based on amaterial included in the emissive layer 120. The emissive layer 120 maybe formed by sequentially forming a first semiconductor layer 121, anactive layer 122, and a second semiconductor layer 123 on the uppersurface of the substrate 110.

The first semiconductor layer 121 may be arranged on the upper surfaceof the substrate 110. The first semiconductor layer 121 may include, forexample, an n-type semiconductor. However, the first semiconductor layer121 is not limited thereto, and may include a p-type semiconductoraccording to circumstances. The first semiconductor layer 121 mayinclude a Group III-V n-type semiconductor such as n-GaN. The firstsemiconductor layer 121 may have a single-layer or multi-layerstructure.

The active layer 122 may be arranged on an upper surface of the firstsemiconductor layer 121. The active layer 122 may emit light aselectrons and holes combine with each other. The active layer 122 mayhave a multi-quantum well (MQW) structure. The active layer 122,however, is not limited thereto, and may also have a single-quantum well(SQW) structure. The active layer 122 may include a Group III-Vsemiconductor, for example, GaN. Meanwhile, while the active layer 122formed as a two-dimensional thin film is illustrated as an example, theactive layer 122 is not limited thereto and may also have athree-dimensional shape such as a rod shape or a pyramid structurethrough growth by using a mask.

The second semiconductor layer 123 may be arranged on an upper surfaceof the active layer 122. The second semiconductor layer 123 may include,for example, a p-type semiconductor. However, the second semiconductorlayer 123 is not limited thereto and may include an n-type semiconductoraccording to circumstances. The second semiconductor layer 123 mayinclude a Group III-V p-type semiconductor such as p-GaN. The secondsemiconductor layer 123 may have a single-layer or multi-layerstructure.

The driving layer 130 arranged on the emissive layer 120 may include adriving element 132 used to emit light from the emissive layer 120. Thedriving layer 130 may include an electrode pair (for example, the firstelectrode 131 and a second electrode) that is in contact with theemissive layer 120, a plurality of driving elements 132 connected to theelectrode pair, and a gate line, a data line D, etc. connected to thedriving elements 132.

The number of first electrodes 131 may be equal to that of pixels. Thefirst electrode 131 may be referred to as a pixel electrode. A pluralityof first electrodes 131 may spaced apart from each other on portions ofthe emissive layer 120 to respectively correspond to a plurality ofcolor conversion layers 140R, 140G, and 140B. Each of the firstelectrodes 131 may be in contact with the emissive layer 120, forexample, with the second semiconductor layer 123, and may extend to anupper surface of an insulating layer that is in contact with the secondsemiconductor layer 123.

As each of the first electrodes 131 is in contact with the emissivelayer 120 through holes, an area of contact between the first electrodes131 and the second semiconductor layer 123 may be limited. Thus, acurrent supplied from the first electrodes 131 to the secondsemiconductor layer 123 may be limited to the holes. Accordingly, lightmay be generated mainly from an area of the active layer 122 below thecolor conversion layers 140R, 140B, and 140B of certain colors. Thelight may only be incident to the color conversion layers 140R, 140B,and 140B of certain colors, to which the light corresponds, and is lesslikely to proceed to other pixels nearby. According to an embodiment,even when the light travels in another direction than toward the holes,the light is totally internally reflected by one or more insulatinglayers 133 having a refractive index that is less than the emissivelayer 120, and thus, light generated in a certain pixel is not emittedthrough other pixels and degradation in a color quality may be reducedaccordingly.

The plurality of first electrodes 131 may be arranged to respectivelycorrespond to the plurality of pixels PR, PG, and PB, that is, theplurality of color conversion layers 140R, 140B, and 140B in aone-to-one correspondence. For example, the first electrodes 131 may berespectively arranged below a first color conversion layer 140R, asecond color conversion layer 140G, and a third color conversion layer140B.

The first electrodes 131 may include a transparent conductive material.For example, the first electrodes 131 may include indium tin oxide(ITO), ZnO, indium zinc oxide (IZO), Ag, Au, Ni, graphene, or nanowire.However, the first electrode 131 is not limited thereto. In theabove-described manner, when light generated in the emissive layer 120is incident, through the first electrodes 131, to the color conversionlayers 140R, 140B, and 140B of colors to which the light corresponds,light loss may be reduced.

Each of the plurality of first electrodes 131 may also be electricallyconnected also to each of the plurality of driving elements 132 in aone-to-one correspondence. The driving elements 132 selectively drive atleast one desired pixel from among the pixels PR, PG, and PB. Whiletransistors are illustrated as the driving elements 132 in the drawings,the driving elements 132 are not limited thereto. The driving elements132 may include two or more transistors and one or more capacitors.

According to an embodiment, the driving layer 130 may include aplurality of insulating layers 133. The plurality of insulating layers133 may prevent leakage of a current among pixels and leakage of acurrent between conductive materials constituting the driving elements132. In addition, the insulating layers 133 may also totally internallyreflect light that is incident at an angle greater than a critical anglein the emissive layer 120. The insulating layers 133 may include SiO₂,SiN, Al₂O₃ or TiO₂, or the like, but are not limited thereto.

The plurality of color conversion layers 140R, 140B, and 140B thatconvert light generated in the active layer 122 of the emissive layer120 to light of a certain color to emit the light are arranged on thedriving layer 130. Each of the plurality of the color conversion layers140R, 140B, and 140B may be arranged on portions of the emissive layer120. Accordingly, the plurality of the color conversion layers 140R,140B, and 140B may share one emissive layer 120. The plurality of thecolor conversion layers 140R, 140B, and 140B may be formed using aphotolithography method or the like.

For example, the plurality of the color conversion layers 140R, 140B,and 140B may include the first color conversion layer 140R, the secondcolor conversion layer 140G, and the third color conversion layer 140B.Thus, the first color conversion layer 140R and portions of the emissivelayer 120 and the driving layer 130 under the first color conversionlayer 140R may be a component of a red pixel PR, and the second colorconversion layer 140G and portions of the emissive layer 120 and thedriving layer 130 under the second color conversion layer 140G may be acomponent of a green pixel PG, and the third color conversion layer 140Band portions of the emissive layer 120 and the driving layer 130 underthe third color conversion layer 140B may be a component of a blue pixelPB.

The first color conversion layer 140R may convert light generated in theactive layer 122 to red light R and emit the same. Light generated inthe active layer 122 may be blue light. The first color conversion layer140R may include quantum dots (QDs) that have a certain size and areexcited by blue light to emit red light R. The QDs may have a core-shellstructure having a core portion and a shell portion, or a shell-lessparticle structure. A core-shell structure may have a single-shell or amulti-shell. The multi-shell may be, for example, a double-shell.

The QDs may include at least one of, for example, Group II-VIsemiconductor quantum dots, Group III-V semiconductor quantum dots,Group IV-VI semiconductor quantum dots, Group IV semiconductor quantumdots, and graphene quantum dots. In detail, the QDs may include at leastone of Cd, Se, Zn, S, and InP, but are not limited thereto. Each quantumdot may have a diameter of tens of nm or less, for example, a diameterof 10 nm or less. In addition, the first color conversion layer 140R mayinclude a phosphor that emits red light R by being excited by blue lightgenerated in the active layer 122. The first color conversion layer 140Rmay further include a photoresist having high transmittingcharacteristics or a light scattering agent that uniformly emits redlight R.

The second color conversion layer 140G may convert light generated inthe active layer 122 to green light G and emit the same. The activelayer 122 may generate blue light B. The second color conversion layer140G may include QDs that have a certain size and are excited by bluelight B to emit green light G. In addition, the second color conversionlayer 140G may include a phosphor that emits green light G by beingexcited by blue light B generated in the active layer 122. The secondcolor conversion layer 140G may include a photoresist or a lightscattering agent.

The third color conversion layer 140B may convert light generated in theactive layer 122 to blue light B and emit the same. When blue light B isgenerated in the active layer 122, the third color conversion layer 140Bmay include a transmissive layer through which the blue light Bgenerated in the active layer 122 is transmitted without wavelengthconversion. When the third color conversion layer 140B is a transmissivelayer, the third color conversion layer 140B may include no QDs and mayinclude a photoresist or a light scattering agent such as TiO₂.

Meanwhile, the display apparatus 1 may further include one or morebarriers 150 that spatially separate the plurality of the colorconversion layers 140R, 140B, and 140B apart from each other. Forexample, the barriers 150 may be disposed between the first colorconversion layer 140R and the second color conversion layer 140G,between the second color conversion layer 140G and the third colorconversion layer 140B, and between the third color conversion layer 140Band the first color conversion layer 140R. The barriers 150 may have atapered shape with a width decreasing from a lower portion to an upperportion thereof. The barriers 150 having the tapered shape may increasean aperture ratio of pixels. The barriers 150 may prevent color mixtureamong lights emitted from the first through third color conversionlayers 140R, 140B, and 140B to thereby increase contrast. The barriers150 may include at least one of a black matrix material, a resin, and apolymer.

In the above-described structure, when, for example, a thin filmtransistor corresponding to the first pixel PR is driven and a certainvoltage is applied between a second electrode, which is a commonelectrode, and the first electrode 131 corresponding to the first pixelPR, light is generated in a portion of the active layer 122 locatedbelow the first color conversion layer 140R. When the light is incidenton the first color conversion layer 140R, the first color conversionlayer 140R may convert the light to red light R and emit the same.

Moreover, when the driving element 132 corresponding to the second pixelPG is driven to apply a certain voltage between the second electrode,which is a common electrode, and the first electrode 131 correspondingto the second pixel PG, light is generated in a portion of the activelayer 122 located below the second color conversion layer 140G. As thelight is incident on the second color conversion layer 140G, the secondcolor conversion layer 140G may emit green light G to the outside.

Furthermore, when the driving element 132 corresponding to the thirdpixel PB is driven to apply a certain voltage between the secondelectrode, which is a common electrode, and the first electrode 131corresponding to the third pixel PB, light is generated in a portion ofthe active layer 122 located below the third color conversion layer140B. The light may be transmitted through the third color conversionlayer 140B to be emitted to the outside.

According to the embodiment, the display apparatus 1 having a highresolution and an increased light efficiency may be implemented.Small-sized LED chips corresponding to the pixels PR, PG, and PB are tobe individually manufactured to implement the display apparatus 1 havinga high resolution according to the related art, and transferring thesmall-sized LED chips at appropriate locations is required. In thiscase, the active layers 122, which are a light-emission area, areseparated from each other for each pixel, thus increasing an exposurearea of the active layers 122 and reducing light efficiency. Inaddition, it is difficult to transfer the small-sized LED chips ataccurate positions.

According to an embodiment, the display apparatus 1 may be easilymanufactured without a transfer operation as a plurality of pixels PR,PG, and PB are arranged on one emissive layer 120. For example, theplurality of pixels PR, PG, and PB may be arranged on one active layer122 without a transfer operation. In addition, as the active layer 122,which is a light-emission area, is not exposed in each pixel, lightefficiency may be increased. As described above, sequentially stackingthe emissive layer 120, the driving layer 130, the barrier 150, and thefirst through third color conversion layers 140R, 140B, and 140B on thesubstrate 110 may be referred to as monolithic formation.

As described above, a pixel may be formed by combining the emissivelayer 120, the driving layer 130, and the first through third colorconversion layers 140R, 140B, and 140B. A pixel is not completed justwith the emissive layer 120 and the driving layer 130, without the firstthrough third color conversion layers 140R, 140B, and 140B, and thus, alayer formed of only the emissive layer 120 and the driving layer 130may be referred to as a pre-pixel. For example, portions of the emissivelayer 120 and the driving layer 130 located under the first colorconversion layer 140R may be referred to as a first pre-pixel PPR;portions of the emissive layer 120 and the driving layer 130 locatedunder the second color conversion layer 140G may be referred to as asecond pre-pixel PPG; and portions of the emissive layer 120 and thedriving layer 130 located under the third color conversion layer 140Bmay be referred to as a third pre-pixel PPB (see FIG. 6A).

Meanwhile, in the display apparatus 1 having a pixel size of 500 ppi(pixels per inch) or more, due to the very small pixel size, it isdifficult to pattern the first through third color conversion layers140R, 140B, and 140B by using a mask. Hereinafter, a method ofmanufacturing the display apparatus 1 by patterning the first throughthird color conversion layers 140R, 140B, and 140B by using exposure ofa light-emission region itself will be described.

FIGS. 5 through 14 are reference diagrams regarding a method ofmanufacturing the display apparatus 1. As illustrated in FIG. 5, anemissive layer 120 may be formed on a portion of a substrate 110. Thesubstrate 110 may be used to grow the emissive layer 120. The substrate110 may include various materials used in general semiconductorprocesses. For example, a silicon substrate or a sapphire substrate maybe used as the substrate 110. However, this is merely an example, andother various materials may also be used as the substrate 110. Theemissive layer 120 may include an LED layer based on an inorganicmaterial. The emissive layer 120 may emit, for example, blue light.However, the emissive layer 120 is not limited thereto. The emissivelayer 120 may emit light of a certain wavelength based on a materialincluded in the emissive layer 120.

The emissive layer 120 may be formed by sequentially forming a firstsemiconductor layer 121, an active layer 122, and a second semiconductorlayer 123 on an upper surface of the substrate 110. The firstsemiconductor layer 121 may be arranged on the upper surface of thesubstrate 110. The first semiconductor layer 121 may include, forexample, an n-type semiconductor. The active layer 122 may be arrangedon an upper surface of the first semiconductor layer 121. The activelayer 122 may emit light as electrons and holes combine with each other.The active layer 122 may have an MQW structure. The active layer 122,however, is not limited thereto, and may also have an SQW structureaccording to another embodiment. The second semiconductor layer 123 maybe arranged on an upper surface of the active layer 122. The secondsemiconductor layer 123 may include, for example, a p-typesemiconductor. A surface area of the emissive layer 120 may be greaterthan a pixel size. The emissive layer 120 may be formed on the entiredisplay area DA of the substrate 110.

As illustrated in FIG. 6A, a driving layer 130 may be formed on theemissive layer 120. The driving layer 130 may include an electrode pair(for example, the first electrode 131 and a second electrode that is incontact with the emissive layer 120, a plurality of driving elements 132connected to the electrode pair, a scan line, a data line, etc.connected to the driving elements 132. The number of first electrodes131 may be equal to a number of pixels. The first electrodes 131 may bereferred to as pixel electrodes. A plurality of first electrodes 131 maybe arranged to respectively correspond to the plurality of pixels PR,PG, and PB in a one-to-one correspondence. The driving layer 130 mayalso include a plurality of driving elements 132 respectivelycorresponding to the plurality of pixels PR, PG, and PB in a one-to-onecorrespondence and may include one or more insulating layers 133preventing leakage of a current between the electrode pair and thedriving elements 132. According to an embodiment, the one or moreinsulating layer 133 may include a plurality of insulating layers.

A pixel is not completed not just with the emissive layer 120 and thedriving layer 130 illustrated in FIG. 6A. Thus, portions of the emissivelayer 120 and the driving layer 130, on which a first color conversionlayer 140R is to be formed, may be referred to as a first pre-pixel PPR;portions of the emissive layer 120 and the driving layer 130, on which asecond color conversion layer 140G is to be formed, may be referred toas a second pre-pixel PPG; and portions of the emissive layer 120 andthe driving layer 130, on which a third color conversion layer 140B isto be formed, may be referred to as a third pre-pixel PPB. In addition,an area where the first through third pre-pixels PPR, PPG, and PPR arepresent is referred to as a pre-display area PDA.

According to an embodiment, the driving layer 130 may include, asillustrated in FIG. 6B, scan lines S that are respectively electricallyconnected to the plurality of driving elements 132 to transmit a scansignal and data lines D that are respectively electrically connected tothe driving elements 132 to transmit a data signal in response to a scansignal. The scan lines S and the data lines D may be formed not only inthe pre-display area PDA but may also extend to a non-display area NDA.In addition, in the non-display area NDA, first electrode pads EP1having a first end contacting the scan lines S may be formed, and secondelectrode pads EP2 having a first end contacting the data lines D may beformed. The first electrode pads EP1 may be contacted by a scan driver20, and the second electrode pads EP2 may be contacted by a data driver30.

Meanwhile, the second electrode pads EP2 may be formed to overlap thedata lines D, and the data lines D may extend beyond the secondelectrode pads EP2. The data lines D and the second electrode pads EP2may be formed of a same material and may be formed as a single unit.

In addition, in the non-display area NDA of the substrate 110, exposurelines E1, E2, and E3 connected to the data lines D may be formed. Theexposure lines E1, E2, and E3 refer to lines to which a signal used toform the first through third color conversion layers 140R, 140B, and140B is applied. The exposure lines E1, E2, and E3 may be formed of aconductive material. For example, the exposure lines E1, E2, and E3 mayalso be formed of a material identical to a material used to form thescan line S or the data line D.

For example, the exposure lines E1, E2, and E3 may include a firstexposure line E1 used to form the first color conversion layer 140R, asecond exposure line E2 used to form the second color conversion layer140G, and a third exposure line E3 used to form the third colorconversion layer 140B. The first through third exposure lines E1, E2,and E3 may be arranged in a direction crossing a data line D, forexample, in a first direction, and may not be electrically connected toeach other.

The first exposure line E1 may be connected to data lines D connected toa pre-pixel, which is to be a pixel emitting red light, that is, firstpre-pixels PPR, from among the data lines D. The second exposure line E2may be connected to data lines D connected to a pre-pixel, which is tobe a pixel emitting green light, that is, second pre-pixels PPG, fromamong the data lines D. The third exposure line E3 may be connected todata lines D connected to a pre-pixel, which is to be a pixel emittingblue light, that is, third pre-pixels PPB, from among the data lines D.

Electrical connection between first through third exposure lines E1, E2,and E3 and the data lines D may be determined based on a pixel type ofthe display apparatus 1. For example, when a display is a pixel type inwhich RGB colors are sequentially repeated and 3 m data lines D areincluded (m being an integer), the first exposure line E1 may beelectrically connected to first, fourth, . . . , 3k+1(th), . . . ,3m−2(th) data lines D, the second exposure line E2 may be electricallyconnected to second, fifth, . . . , 3k+2(th), . . . , and 3m−1(th) datalines D, and the third exposure line E3 may be electrically connected tothird, sixth, 3k+3(th), . . . , and 3m(th) data lines D.

Third electrode pads EP3 may be arranged on each of the first throughthird exposure lines E1, E2, and E3, and fourth electrode pads EP4 andconducive lines overlapping the fourth electrode pads EP4 may bearranged in the non-display area NDA. The third electrode pads EP3 maybe contacted by an exposure controlling apparatus, and the fourthelectrode pads EP4 may be contacted by an exposure controlling apparatusor a processor.

In addition, as illustrated in FIG. 7A, a barrier 150 defining a pixelsize may be formed on the display area DA of the substrate 110. Thebarrier 150 may have a tapered shape with a width decreasing from alower portion to an upper portion thereof. The barrier 150 may includeat least one of a black matrix material, a resin, and a polymer.

Then, as illustrated in FIG. 7B, a scan driver 20 and an exposurecontrolling apparatus 200 may be mounted in the non-display area NDA ofthe substrate 110. The scan driver 20 may be arranged adjacent to thefirst electrode pads EP1. The scan driver 20 may also be in contact withconductive lines overlapping the fourth electrode pads EP4.

The exposure controlling apparatus 200 may be arranged to be in contactwith the third electrode pads EP3 and the fourth electrode pads EP4.Thus, the exposure controlling apparatus 200 may electrically connectthe scan driver 20 to the first, second, and third exposure lines E1,E2, and E3. The exposure controlling apparatus 200 applies an electricalsignal to the scan driver 20 and the exposure lines E1, E2, and E3 suchthat light is emitted from a particular area of the emissive layer 120,that is, the first, second, and third pre-pixels PPR, PPG, and PPB. Theemitted light may be used to form the first through third colorconversion layers 140R, 140B, and 140B.

Next, a method of forming the first through third color conversionlayers 140R, 140B, and 140B by using the exposure lines E1, E2, and E3will be described according to an embodiment. As illustrated in FIG. 8A,a first color conversion material 310 may be formed on the driving layer130. The first color conversion material 310 may be formed on an entireportion of the driving layer 130. According to an embodiment, the firstcolor conversion material 310 may be formed only a first pre-pixel PPR.As a method of forming the first color conversion material 310, spincoating or a spray method or the like may be applied.

In addition, as illustrated in FIG. 8B, the exposure controllingapparatus 200 may apply a scan control signal to the scan driver 20, anon signal Von to the first exposure line E1 (V_(E1)), and an off signalVoff to the second and third exposure lines E2 and E3 (V_(E2) andV_(E3)). Then the scan driver 20 may respectively and sequentially applyscan signals Vs1, Vs2, . . . , Vsn to scan lines according to a scancontrol signal. Then, as illustrated in FIG. 8A, light is emitted from alight-emission area of the emissive layer 120, which is electricallyconnected to the first exposure line E1 and a scan line, to which a scansignal is applied. The first color conversion material 310 arrangedabove the area from which light is emitted may be hardened into thefirst color conversion layer 140R.

As illustrated in FIG. 9, the first color conversion material 310 thatis not hardened may be removed from the substrate 110. The first colorconversion material 310 that is not hardened may be removed from thesubstrate 110 by using a developing solution. The developing solutionmay be water. As the first color conversion material 310 that ishardened is turned into the first color conversion layer 140R, the firstpixel PR may be completed. The first pixel PR may be a red pixelemitting red light.

In addition, as illustrated in FIG. 10A, a second color conversionmaterial 320 may be formed on the driving layer 130. According to anembodiment, the second color conversion material 320 may be formedoverall on the driving layer 130. According to an embodiment, the secondcolor conversion material 320 may be formed only on a second pre-pixelPPG. As a method of forming the second color conversion material 320,spin coating or a spray method or the like may be applied.

In addition, as illustrated in FIG. 10B, the exposure controllingapparatus 200 may apply a scan control signal to the scan driver 20, anon signal Von to the second exposure line E2 (V_(E2)), and an off signalVoff to the first and third exposure lines E1 and E3 (V_(E1) andV_(E3)). Then, the scan driver 20 may respectively and sequentiallyapply scan signals Vs1, Vs2, . . . , Vsn to scan lines according to ascan control signal. Then, as illustrated in FIG. 10A, light is emittedfrom a light-emission area of the emissive layer 120, which iselectrically connected to the second exposure line E2 and a scan line,to which a scan signal is applied. The second color conversion material320 arranged above the area from which light is emitted may be hardenedinto the second color conversion layer 140G.

As illustrated in FIG. 11, the second color conversion material 320 thatis not hardened may be removed from the substrate 110. The second colorconversion material 320 that is not hardened may be removed from thesubstrate 110 by using a developing solution. The developing solutionmay be water. As the second color conversion material 320 that ishardened is turned into the second color conversion layer 140G, thesecond pixel PG may be completed. The second pixel PG may be a greenpixel emitting green light.

Likewise, as illustrated in FIG. 12A, the exposure controlling apparatus200 may apply a scan control signal to the scan driver 20, an on signalVon to the third exposure line E3 (VE3), and an off signal Voff to thefirst and second exposure lines E1 and E2 (V_(E1) and V_(E2)). Then thescan driver 20 may respectively and sequentially apply scan signals Vs1,Vs2, . . . , Vsn to scan lines according to a scan control signal. Then,as illustrated in FIG. 12A, light is emitted from a light-emission areaof the emissive layer 120, which is electrically connected to the thirdexposure line E3 and a scan line, to which a scan signal is applied. Athird color conversion material 330 arranged above the area from whichlight is emitted may be hardened into the third color conversion layer140B.

As illustrated in FIG. 13, the third color conversion material 330 thatis not hardened may be removed from the substrate 110. The third colorconversion material 330 that is not hardened may be removed from thesubstrate 110 by using a developing solution. The developing solutionmay be water. As the third color conversion material 330 that ishardened is turned into the third color conversion layer 140B, the thirdpixel PB may be completed. The third pixel PB may be a blue pixelemitting blue light.

According to an embodiment, after forming the first pixel PR, secondpixel PG and third pixel PB, the exposure controlling apparatus 200 maybe removed. For example, as illustrated in FIG. 14, the substrate 110may be separate into an area where the display unit 10 is formed and anarea where the first through third exposure lines E1, E2, and E3 areformed, and area where the first through third exposure lines E1, E2,and E3 are formed may be removed. The data lines D between the secondelectrode pads EP2 and the first through third exposure lines E1, E2,and E3 may be cut to remove the first through third exposure lines E1,E2, and E3.

The data lines D may still remain in an outer portion of the secondelectrode pads EP2. Each of the second electrode pads EP2 may include afirst side I1 that faces the display unit 10 and is relatively close tothe display unit 10 and a second side O1 that is relatively far from thedisplay unit 10. The data lines D may extend to protrude toward thesecond side O1 of the first electrode pad EP1. The data lines D thatprotrude as described above do not contribute to a display operation,and thus may be referred to as dummy lines dD. Next, by combining thedata driver 30 and other components, the display apparatus 1 may becompleted.

As described above, as the color conversion layers 140R, 140B, and 140Bare formed by being hardened by light emitted from an area of theemissive layer 120, at least one of a thickness, area, and shape of thefirst through third color conversion layers 140R, 140B, and 140B may beaffected by properties of the emitted light. The properties of light maybe at least one of an emission time of the light, an emission intensity,an area of light emission, and a range of light emission.

For example, the longer a light emission time of emitted light, the morea color conversion material may be hardened. Alternatively, the longerthe emission time, the thicker the first through third color conversionlayers 140R, 140B, and 140B in a thickness direction may be. Similarly,the higher the emission intensity, the higher a degree of hardening of acolor conversion material may be. For example, the higher the emissionintensity, the thicker the first through third color conversion layers140R, 140G, and 140B in a thickness direction may be. Further, thegreater an area of light emission of the emitted light, the greater anarea of the hardened color conversion material in a horizontal directionmay be.

As the first through third color conversion materials 310, 320, and 330are hardened by light emitted from the emissive layer 120, an additionalexposure apparatus for hardening the first through third colorconversion materials 310, 320, and 330 is not necessary, thus increasingthe efficiency of manufacturing of a display apparatus. In addition,since the light conversion materials are hardened by light emitted fromthe emissive layer 120, the first through third color conversionmaterials 310, 320, and 330 are exposed from a lower portion thereof,and thus, a defect that the first through third color conversion layers140R, 140B, and 140B separate from the driving layer 130 may beprevented.

In addition, since the scan driver 20, which is an essential componentof the display apparatus 1, is used without change for self-exposure ofthe display apparatus 1, the exposure time and the exposure intensitymay be accurately controlled. Since one exposure line (the first,second, or third exposure lines E1, E2, or E3) is used to form one colorconversion layer (the first, second, or third color conversion layer140R, 140G, or 140B), control of an exposure signal may be easy.

While removal of the first through third exposure lines E1, E2, and E3by cutting the substrate 110 is described with reference to FIG. 14, thedisclosure is not limited thereto. The first through third exposurelines E1, E2, and E3 may be included in the display apparatus 1. FIG. 15illustrates a display apparatus including first through third exposurelines E1, E2, and E3 according to an embodiment. As illustrated in FIG.15, in a non-display area NDA, first connection lines CL1 that arerespectively electrically connected to data lines D, switching devicesSW that are respectively electrically connected to the first connectionlines CL1 and one of the first through third exposure lines E1, E2, andE3, a second connection line CL2 connected to the switching devices SW,and a fifth electrode pad EP5 arranged on the second connection linesCL2 may be further arranged. The first connection lines CL1 may bearranged in a same direction as the data lines D, and may be formed ofan identical material to that of the data lines D. Then, the secondconnection line CL2 may be arranged in a same direction as the scanlines S, and may be formed of an identical material to that of the scanlines S. The switching devices SW may be transistors.

Each switching device SW may be electrically connected to each data lineD, and may be electrically connected to any one of the first throughthird exposure lines E1, E2, and E3. Switching devices SW connected tothe first exposure line E1 may be referred to as a first group switchingdevice; switching devices SW connected to the second exposure line E2may be referred to as a second group switching device, and switchingdevices SW connected to the third exposure line E3 may be referred to asa third group switching device.

While the exposure controlling apparatus 200 has applied an on signal tothe switching devices SW via the second connection line CL2 and a scancontrol signal to the scan driver 20, the exposure controlling apparatus200 may apply an on signal Von to the first exposure line E1. Then thefirst group switching device connected to the first exposure line E1 maybe turned on. The on signal Von of the first exposure line E1 may thenbe applied to the first pre-pixels PPR via the first group switchingdevice SW, thereby emitting light. Accordingly, the first colorconversion layer 140R may be formed.

Likewise, while the exposure controlling apparatus 200 has applied (anon signal to the switching devices SW via the second connection line CL2and a scan control signal to the scan driver 20, the exposurecontrolling apparatus 200 may apply an on signal Von to the secondexposure line E2, thereby turning on the second group switching deviceconnected to the second exposure line E2. The on signal Von of thesecond exposure line E2 may then be applied to the second pre-pixels PPGvia the second group switching device SW, thereby emitting light.Accordingly, the second color conversion layer 140G may be formed. Thethird color conversion layer 140B may also be formed in the same manner.

When formation of the first through third color conversion layers 140R,140B, and 140B is completed, the exposure controlling apparatus 200 mayturn off the switching devices SW. Next, the switching devices SW may becontrolled using the processor 40 such that the switching devices SW aremaintained in an off state.

While the first through third exposure lines E1, E2, and E3 aredescribed as being connected in one display area, the disclosure is notlimited thereto. A plurality of display areas DA may also bemanufactured on one substrate 110. FIG. 16 illustrates a substrate 110on which a plurality of pre-display areas PDA are formed. As illustratedin FIG. 16, a plurality of each of emissive layers and driving layersthat are spaced apart from each other may be formed on the substrate110. An area of the substrate 110 where an emissive layer and a drivinglayer are formed may be referred to as a pre-display area PDA, andregions except the display area DA may be a non-display area NDA. Someelements of the driving layer 130, that is, scan lines S and data linesD, may extend to the non-display area NDA. In the non-display area NDA,a plurality of scan drivers 20 connected to the scan lines Srespectively included in the plurality of driving layers may bearranged.

In addition, in the non-display area NDA, first through third exposurelines E1, E2, and E3 that are electrically connected to the data lines Dmay be arranged. The data lines D may be classified into a plurality ofgroups, and data lines D of each group may be electrically connected toeach of the first through third exposure lines E1, E2, and E3. Forexample, first group data lines for emitting red light may be connectedto the first exposure line E1, and second group data lines for emittinggreen light may be connected to the second exposure line E2, and thirdgroup data lines for emitting blue light may be connected to the thirdexposure line E3. The plurality of driving layers may share the exposurelines E1, E2, and E3.

In addition, scan control lines E5 connected to the plurality of scandrivers 20 may be arranged in the non-display area NDA. The plurality ofscan drivers 20 may share the scan control lines. Thus, one exposurecontrolling apparatus 200 may respectively and simultaneously form colorconversion layers on a plurality of driving layers. A method of formingeach of the color conversion layers is identical to a method of forminga color conversion layer on one driving layer, and thus, detaileddescription thereof will be omitted.

As the color conversion layers are formed, display units that are spacedapart from each other on one substrate 110 may be formed. The substrate110 may be cut into units of the display units, and portions of thesubstrate 110 on which the first through third exposure lines E1, E2,and E3 and the scan control lines E5 are formed may be removed.

While forming of a color conversion layer by using the scan drivers 20is described above, the disclosure is not limited thereto. FIG. 17 is areference diagram illustrating a method of forming a color conversionlayer without using a scan driver, according to an embodiment. Asillustrated in FIG. 17, a pre-display area PDA may be formed on thesubstrate 110. The pre-display area PDA may include an emissive layerand a driving layer. A plurality of pre-display areas PDAs arranged in asame column on the substrate 110 may share scan lines S. The scan linesS may be connected to an exposure controlling apparatus 200.Accordingly, the exposure controlling apparatus 200 may directly apply ascan signal to the plurality of pre-display areas PDA. Alternatively,while the scan lines S are turned on, the exposure controlling apparatus200 may sequentially apply an on signal Von to first through thirdexposure lines E1, E2, and E3 to form first through third colorconversion layers 140R, 140B, and 140B. As the first through third colorconversion layers 140R, 140B, and 140B are formed, a plurality ofdisplay units 10 may be formed on the substrate 110.

After completing the first through third color conversion layers 140R,140B, and 140B, the substrate 110 may be cut in units of the displayunits 10. FIG. 18 illustrates an example of the substrate 110 that iscut in the embodiment of FIG. 17. As illustrated in FIG. 18, as thesubstrate 110 is cut in units of the display units 10, the scan lines Smay protrude out of the first electrode pads EP1 and the display unit 10and remain.

For example, the first electrode pads EP1 may include a first side 12that faces the display unit 10 and is relatively close to the displayunit 10 and a second side O2 that is relatively far from the displayunit 10. The scan lines S may remain to protrude out of the second sideO2 of the first electrode pads EP1. In addition, the display unit 10 mayinclude a first side I3 that faces the first electrode pads EP1 and isrelatively close to the first electrode pads EP1 and a second side O3that is relatively far from the first electrode pads EP1. The scan linesS may remain by protruding out of the second side O3 of the display unit10. An area of the scan lines S remaining by protruding out of thesecond side O2 of the first electrode pads EP1 and an area of the scanline S remaining by protruding out of the second side O3 of the displayunit 10 do not contribute to a displaying operation, and thus theseareas may be referred to as dummy lines dS1 and dS2.

FIG. 19 is a reference diagram for describing a method of forming acolor conversion layer according to another embodiment. When comparingFIGS. 17 and 19, a plurality of pre-display area PDA arranged in a samerow on the substrate 110 illustrated in FIG. 19 may share data lines D.Thus, the exposure controlling apparatus 200 may form a color conversionlayer on the driving layer 130 that is arranged not only on a same rowbut also on a same column, by using one exposure signal. Accordingly,the exposure controlling apparatus 200 may directly apply a scan signalto a plurality of driving layers 130. Alternatively, while the scanlines S are turned on, the exposure controlling apparatus 200 maysequentially apply an on signal Von to the first through third exposurelines E1, E2, and E3 to thereby form a color conversion layer. As thecolor conversion layer is formed, a plurality of display units may beformed on the substrate 110.

After completing the color conversion layer, the substrate 110 may becut in units of the display units. FIG. 20 illustrates an example of thesubstrate 110 that is cut in the embodiment of FIG. 19. As illustratedin FIG. 20, as the substrate 110 is cut in units of the display units10, the data lines D may protrude out of the display unit 10 and remain.

For example, the display unit 10 may include a third side 14 that facesthe second electrode pads EP2 and is relatively close to the secondelectrode pads EP2 and a fourth side O4 that is relatively far from thesecond electrode pads EP2. The data lines D may remain by protruding outof the fourth side O4 of the display unit 10. An area of the data linesD remaining by protruding out of the fourth side O4 of the display unit10 do not contribute to a display operation, and thus may be referred toas a dummy line dD2.

FIG. 21 is a reference diagram illustrating a method of forming a colorconversion layer in a display apparatus including a switching circuit50, according to another embodiment. As illustrated in FIG. 21, thedisplay apparatus may include a switching circuit 50. The switchingcircuit 50 may be implemented in a form of a 3:1 MUX (i.e.,multiplexer). The data lines D may be connected to the switching circuit50 as those data lines D connected to pixels that are used to obtainwhite balance are grouped. Then the switching circuit 50 may beelectrically connected to one exposure line E via a third connectionline CL3. Sixth pad electrodes EP6 that may be in contact with a datadriver may be formed in the third connection line CL3. When an on signalVon is applied to the exposure line E, the switching circuit 50 may turnon switching devices SW for each color, thereby forming a colorconversion layer.

The exposure controlling apparatus 200 may form a color conversion layerby controlling the switching circuit 50 and the scan driver 20 while anon signal Von is applied to the exposure line E. However, the disclosureis not limited thereto, and a switching circuit may also be implementedin the form of a MUX of n:1 (where n is an integer greater than 2). Asis obvious, a plurality of exposure lines may be included according to aform of the switching circuit 50. After the color conversion layer isformed, the third connection line CL3 may be cut, thereby removing theexposure line E. The third connection line CL3 may protrude outside thesixth electrode pads EP6 and remain.

For example, the sixth electrode pads EP6 may include a first side 15that faces the display unit 10 and is relatively close to the displayunit 10 and a second side O5 that is relatively far from the displayunit 10. The third connection line CL3 may remain by protruding towardthe second side O5 of the sixth electrode pads EP6. An area of the thirdconnection line CL3 remaining by protruding out of the second side O5 ofthe sixth electrode pads EP6 does not contribute to a display operation,and thus may be referred to as a dummy line Dcl3.

FIG. 22 is a reference diagram illustrating a method of applying asignal to first through third exposure lines E1, E2, and E3, accordingto another embodiment. Before applying an on signal Von to the firstthrough third exposure lines E1, E2, and E3, a discharge signal Vd maybe applied to the first through third exposure lines E1, E2, and E3. Forexample, after forming a first exposure line E1 by applying an on signalVon to the first exposure line E1, a discharge signal Vd may be appliedto the first through third exposure lines E1, E2, and E3 to discharge acharge present in the emissive layer 120 and the driving layer 130.Then, after forming a second color conversion layer 140G by applying anon signal Von to the second exposure line E2, a discharge signal Vd maybe applied to the first through third exposure lines E1, E2, and E3 todischarge a charge present in the emissive layer 120 and the drivinglayer 130. Also, after forming a third color conversion layer 140B byapplying an on signal Von to the third exposure line E3, a dischargesignal Vd may be applied to the first through third exposure lines E1,E2, and E3 to discharge a charge present in the emissive layer 120 andthe driving layer 130.

Amplitude of the discharge signal Vd may be equal to that of a commonvoltage applied to the display apparatus. When the charge present in theemissive layer 120 and the driving layer 130 is discharged, emission oflight from a light-emission area to which no exposure signal is appliedmay be prevented.

The method of forming a color conversion layer with respect to RGBpixels is described above. However, the method is not limited thereto.The same method may also apply to RGGR pixels. A same exposure line maybe connected to same pre-pixels. Light may be emitted from a certainlight-emission area based on a combination of an exposure signal and ascan signal. A color conversion layer of various pixel types such asRGBW pixels may be formed.

According to an embodiment, a semiconductor device may be providedhaving a substrate, an emissive layer provided on a substrate, a drivinglayer provided on the emissive layer and a semiconductor layer selfformed on the driving layer, the semiconductor layer hardened based onlight emitted from the emissive layer.

The self-formed semiconductor layer may be a color conversion layer.

The semiconductor layer may include quantum dots.

According to an embodiment, a method of manufacturing the semiconductordevice may be provided. The method may include providing an emissivelayer on a substrate, providing a driving layer provided on the emissivelayer providing a semiconductor layer formed on the driving layer andhardening the semiconductor layer based on light emitted from theemissive layer.

While the disclosure has been particularly shown and described withreference to embodiments thereof, it will be understood by one ofordinary skill in the art that various changes in form and details maybe made therein without departing from the spirit and scope of thedisclosure as defined by the following claims. Thus, the embodimentsshould be considered in a descriptive sense only and not for purposes oflimitation. Therefore, the scope of the disclosure is defined not by thedetailed description of the disclosure but by the following claims, andall differences within the scope will be construed as being included inthe disclosure.

It should be understood that embodiments described herein should beconsidered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould typically be considered as available for other similar featuresor aspects in other embodiments.

While one or more embodiments have been described with reference to thefigures, it will be understood by those of ordinary skill in the artthat various changes in form and details may be made therein withoutdeparting from the spirit and scope as defined by the following claims.

What is claimed is:
 1. A display apparatus comprising: an emissive layeron a first area of a substrate; a driving layer comprising a pluralityof driving elements used to emit light from the emissive layer; anexposure line on a second area of the substrate, the exposure line beingelectrically connected to the driving layer; and a color conversionlayer on the emissive layer, wherein a signal is applied to the exposureline to emit the light from an area of the emissive layer correspondingto the exposure line to an area of the color conversion layercorresponding to the exposure line.
 2. The display apparatus of claim 1,wherein the signal is used to harden the color conversion layer.
 3. Thedisplay apparatus of claim 1, wherein the color conversion layercomprises quantum dots.
 4. The display apparatus of claim 1, wherein theemissive layer comprises: a plurality of light-emission areasrespectively corresponding to a plurality of pixels.
 5. The displayapparatus of claim 1, wherein the driving layer comprises: a pluralityof scan lines extending in a first direction; and a plurality of datalines extending in a second direction intersecting the first direction,wherein the plurality of driving elements are respectively connected tothe plurality of scan lines and the plurality of data lines, and theplurality of data lines are electrically connected to the exposure line.6. The display apparatus of claim 5, wherein the exposure line extendsin a direction intersecting the second direction.
 7. The displayapparatus of claim 5, wherein the exposure line extends in the firstdirection.
 8. The display apparatus of claim 5, wherein the exposureline comprises: a first exposure line for hardening a first colorconversion layer of the color conversion layer; and a second exposureline for hardening a second color conversion layer of the colorconversion layer, wherein the first exposure line is connected to afirst group data line from among the plurality of data lines, and thesecond exposure line is connected to a second group data line from amongthe plurality of data lines.
 9. The display apparatus of claim 8,wherein, when an on signal is applied to the first exposure line, an offsignal is applied to the second exposure line, and when an on signal isapplied to the second exposure line, an off signal is applied to thefirst exposure line.
 10. The display apparatus of claim 8, wherein athird signal is further applied to the first exposure line and thesecond exposure line to discharge a charge in the emissive layer and theplurality of driving elements.
 11. The display apparatus of claim 5,wherein the signal is applied while a scan signal is applied to theplurality of scan lines.
 12. The display apparatus of claim 5, whereinthe signal is applied while an on signal is applied to the plurality ofscan lines.
 13. The display apparatus of claim 5, wherein the exposureline is directly connected to one or more of the plurality of datalines.
 14. The display apparatus of claim 5, wherein the exposure lineis electrically connected to the plurality of data lines via a switchingdevice.
 15. The display apparatus of claim 14, wherein the switchingdevice comprises a plurality of transistors which electrically connecteach of the plurality of data lines to the exposure line.
 16. Thedisplay apparatus of claim 14, wherein the switching device comprises amultiplexer.
 17. The display apparatus of claim 1, further comprising aplurality of barriers defining a pixel on the driving layer.
 18. Thedisplay apparatus of claim 17, wherein at least one of the plurality ofbarriers has a tapered shape with a width decreasing from a lowerportion to an upper portion thereof.
 19. The display apparatus of claim17, wherein a size of the pixel is 500 ppi or more.
 20. The displayapparatus of claim 1, wherein the emissive layer, the driving layer, theexposure line, and the color conversion layer are monolithicalstructure.